README

This EGOTableViewPullRefresh fork is an aggregate of my own improvements and tweaks as well as handpicked pull requests submitted but not yet merged into the original repo.

Some changes:
- converted to arc
- localized text
- fixed timestamp formatting
- optimized timestamp NSDateFormatter performance by making it static
- added custom initializer for easier skinning
- removed NSUserDefaults update, the app model should not be touched in a view component
- fixed an animation race condition bug